pharyngeal vein vs vena

pharyngeal vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
pharyngeal vein	Yes	No	No	No
vena	Yes	No	No	No

As nouns, vena is a hypernym of pharyngeal vein; that is, vena is a word with a broader meaning than pharyngeal vein:

pharyngeal vein: veins from the pharyngeal plexus that empty into the internal jugular vein
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of pharyngeal vein include vein, venous blood vessel.

pharyngeal vein (noun)	vena (noun)
veins from the pharyngeal plexus that empty into the internal jugular vein	a blood vessel that carries blood from the capillaries toward the heart